/*
 * Copyright 2015 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache License, version 2.0 (the
 * "License"); you may not use this file except in compliance with the License. You may obtain a
 * copy of the License at:
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License
 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 */
package io.netty.microbench.http2;

import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.http2.Http2Exception;
import io.netty.handler.codec.http2.Http2RemoteFlowController;
import io.netty.handler.codec.http2.Http2Stream;

import static io.netty.handler.codec.http2.Http2CodecUtil.MAX_INITIAL_WINDOW_SIZE;

public final class NoopHttp2RemoteFlowController
        implements Http2RemoteFlowController
{
    public static final NoopHttp2RemoteFlowController INSTANCE = new NoopHttp2RemoteFlowController();

    private ChannelHandlerContext ctx;

    private NoopHttp2RemoteFlowController()
    {
    }

    @Override
    public void initialWindowSize(int newWindowSize) throws Http2Exception
    {
    }

    @Override
    public int initialWindowSize()
    {
        return MAX_INITIAL_WINDOW_SIZE;
    }

    @Override
    public int windowSize(Http2Stream stream)
    {
        return MAX_INITIAL_WINDOW_SIZE;
    }

    @Override
    public boolean isWritable(Http2Stream stream)
    {
        return true;
    }

    @Override
    public void incrementWindowSize(Http2Stream stream, int delta)
            throws Http2Exception
    {
    }

    @Override
    public void writePendingBytes() throws Http2Exception
    {
    }

    @Override
    public void listener(Listener listener)
    {
    }

    @Override
    public void addFlowControlled(Http2Stream stream, FlowControlled payload)
    {
        // Don't check size beforehand because Headers payload returns 0 all the
        // time.
        do
        {
            payload.write(ctx, MAX_INITIAL_WINDOW_SIZE);
        }
        while (payload.size() > 0);
    }

    @Override
    public boolean hasFlowControlled(Http2Stream stream)
    {
        return false;
    }

    @Override
    public void channelHandlerContext(ChannelHandlerContext ctx)
            throws Http2Exception
    {
        this.ctx = ctx;
    }

    @Override
    public ChannelHandlerContext channelHandlerContext()
    {
        return ctx;
    }

    @Override
    public void channelWritabilityChanged() throws Http2Exception
    {
    }

    @Override
    public void updateDependencyTree(int childStreamId, int parentStreamId,
            short weight, boolean exclusive)
    {
    }
}
